Thank you for the details, and pointer to a solution. I've just installed gopass. I also (in looking through other threads) found https://github.com/gopasspw/g

Thank you for the details, and pointer to a solution. I've just installed gopass. I also (in looking through other threads) found https://github.com/gopasspw/gopass https://github.com/gopasspw/gopass and by reading the code learned how TOTP works.